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Help contents > Configuring the MCU > Configuring network settings

Configuring network settings

To configure the network settings on the MCU and check the network status, go to Network  > Port A or Network > Port B.

The MCU has two Ethernet interfaces, Port A and Port B. The configuration pages for the two interfaces look and behave similarly, and so are described together. Differences will be noted as appropriate.

Port A can be configured to be allocated its IP address by DHCP. Port B cannot use DHCP. Connect Port A to your local network and connect Port B to a second subnet or the internet depending on your application of the MCU.

On this page:

IP configuration settings

These settings determine the IP configuration for the appropriate Ethernet port of the MCU. When you have finished, click Update IP configuration and then reboot the MCU.

 

Field Field description Usage tips
Port enabled

Whether the port is enabled or disabled. When enabled, the port will allow IP traffic to flow; when disabled, IP traffic will not pass into or out of the MCU on this port.

Port A can never be disabled because it is the primary interface of the MCU.

Host name

Specifies a name for the MCU.

Depending on your network configuration, you may be able to use this host name to communicate with the MCU, without needing to know its IP address.

IP configuration

Specifies whether the MCU obtains its own IP address for this port automatically via DHCP (Dynamic Host Configuration Protocol), or whether or if it should use the values that you specify in the Manual configuration fields below.

Click Renew DHCP to request a new IP address if you have selected automatic configuration.

Manual configuration
IP address

Identifies the dot-separated IPv4 address for this port, for example 192.168.4.45.

You only need to specify this option if you have chosen Manual IP configuration, as described above.

For Port A, if the IP configuration setting is set to Automatic by DHCP this setting will be ignored

Subnet mask

Identifies the subnet mask required for the IP address you wish to use, for example 255.255.255.0.

 
Default gateway

Identifies the IP address of the default gateway on this subnet, for example 192.168.4.1.

 

Name server (DNS)

Identifies the IP address of the name server.

 

Secondary name server (DNS)

Identifies an optional second name server.

The secondary DNS server is only used if the first is unavailable. If the first returns that it does not know an address, the secondary DNS server will not be queried.

Domain name (DNS suffix)

Specifies an optional suffix to add when performing DNS lookups.

This can allow you to use non-fully qualified host names when referring to a device by host name instead of IP address.

For example, if the domain name is set to codian.com, then a request to the name server to look up the IP address of host endpoint will actually lookup endpoint.codian.com.

IP status

Use the IP Status fields to verify the current IP settings for the appropriate Ethernet port of the MCU, which were obtained using DHCP or configured manually (see IP configuration settings) including:

Ethernet configuration

These settings determine the Ethernet settings for the appropriate port of the MCU. Refer to the table for assistance with these settings. When you have finished, you must press Update Ethernet configuration to make the changes take effect.

 

Field Field description Usage tips
Ethernet settings

Specify whether you want this Ethernet port to automatically negotiate its Ethernet settings with the device it is connected to, or if it should use the values that you specify in the Manual configuration fields below.

It is important that your Ethernet settings match those of the device to which this port is connected. For example, both devices must be configured to use automatic negotiation, or both configured with fixed and matching speed and duplex settings (see below).

Manual configuration
Speed

Identifies the connection speed: 10 Mbit/s or 100 Mbit/s. Use automatic negotiation if a connection speed of 1000 Mbit/s is required.

The connection speed must match that of the device to which this port is connected.

You only need to select this option if you have chosen manual Ethernet settings, as described above.

Duplex

Identifies the connection duplex mode:

  • Full duplex
    Both devices can send data to each other at the same time
  • Half duplex
    Only one device can send to the other at a time

The duplex setting must match that of the device to which this port is connected.

You only need to select this option if you have chosen manual Ethernet settings, as described above.

Ethernet status

Field Field description Usage tips
Link status

Indicates whether this Ethernet port is connected to or disconnected from the network.

 
Speed

Shows the speed (10/100/1000 Mbit/s) of the network connection to the MCU on this port.

This value is negotiated with the device to which this port is connected or based on your manual configuration, depending on the settings you chose above.

Duplex

Shows the duplex mode (full/half duplex) of the network connection to this port.

This value is negotiated with the device to which this port is connected or based on your manual configuration, depending on the settings you chose above.

MAC address

Shows the fixed hardware MAC (Media Access Control) address of this port.

This value cannot be changed and is for information only.

Packets sent

Displays a count of the total number of packets sent from this port by the MCU. This includes all TCP and UDP traffic.

When troubleshooting connectivity issues, this information can help you confirm that the unit is transmitting packets into the network.

Packets received

Displays a count of the total number of packets received by this port of the MCU. This includes all TCP and UDP traffic.

When troubleshooting connectivity issues, this information can help you confirm that the unit is receiving packets from the network.

Statistics:

These fields display further statistics for this port.

  • Multicast packets sent
  • Multicast packets received
  • Total bytes sent
  • Total bytes received
  • Receive queue drops
  • Collisions
  • Transmit errors
  • Receive errors

Use these fields for advanced network diagnostics, such as resolution of problems with Ethernet link speed and duplex negotiation.

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